feat: add --next-phase command to poetry version

docs/cli.md

@@ -693,8 +693,17 @@ The table below illustrates the effect of these rules with concrete examples.
 | prerelease | 1.0.3a0 | 1.0.3a1 |
 | prerelease | 1.0.3b0 | 1.0.3b1 |
 
+The option `--next-phase` allows the increment of prerelease phase versions.
+
+| rule       | before  | after   |
+| ---------- |---------|---------|
+| prerelease --next-phase | 1.0.3a0 | 1.0.3b0 |
+| prerelease --next-phase | 1.0.3b0 | 1.0.3rc0 |
+| prerelease --next-phase | 1.0.3rc0 | 1.0.3 |
+
 ### Options
 
+* `--next-phase`: Increment the phase of the current version.
 * `--short (-s)`: Output the version number only.
 * `--dry-run`: Do not update pyproject.toml file.
 

src/poetry/console/commands/version.py

@@ -27,7 +27,7 @@ class VersionCommand(Command):
             "version",
             "The version number or the rule to update the version.",
             optional=True,
-        )
+        ),
     ]
     options = [
         option("short", "s", "Output the version number only"),
@@ -36,6 +36,7 @@ class VersionCommand(Command):
             None,
             "Do not update pyproject.toml file",
         ),
+        option("next-phase", None, "Increment the phase of the current version"),
     ]
 
     help = """\
@@ -62,7 +63,7 @@ def handle(self) -> int:
 
         if version:
             version = self.increment_version(
-                self.poetry.package.pretty_version, version
+                self.poetry.package.pretty_version, version, self.option("next-phase")
             )
 
             if self.option("short"):
@@ -91,7 +92,9 @@ def handle(self) -> int:
 
         return 0
 
-    def increment_version(self, version: str, rule: str) -> Version:
+    def increment_version(
+        self, version: str, rule: str, next_phase: bool = False
+    ) -> Version:
         from poetry.core.constraints.version import Version
 
         try:
@@ -115,7 +118,8 @@ def increment_version(self, version: str, rule: str) -> Version:
             if parsed.is_unstable():
                 pre = parsed.pre
                 assert pre is not None
-                new = Version(parsed.epoch, parsed.release, pre.next())
+                pre = pre.next_phase() if next_phase else pre.next()
+                new = Version(parsed.epoch, parsed.release, pre)
             else:
                 new = parsed.next_patch().first_prerelease()
         else:

tests/console/commands/test_version.py

@@ -55,6 +55,25 @@ def test_increment_version(
     assert command.increment_version(version, rule).text == expected
 
 
+@pytest.mark.parametrize(
+    "version, rule, expected",
+    [
+        ("1.2.3", "prerelease", "1.2.4a0"),
+        ("1.2.3a0", "prerelease", "1.2.3b0"),
+        ("1.2.3a1", "prerelease", "1.2.3b0"),
+        ("1.2.3b1", "prerelease", "1.2.3rc0"),
+        ("1.2.3rc0", "prerelease", "1.2.3"),
+        ("1.2.3-beta.1", "prerelease", "1.2.3rc0"),
+        ("1.2.3-beta1", "prerelease", "1.2.3rc0"),
+        ("1.2.3beta1", "prerelease", "1.2.3rc0"),
+    ],
+)
+def test_next_phase_version(
+    version: str, rule: str, expected: str, command: VersionCommand
+) -> None:
+    assert command.increment_version(version, rule, True).text == expected
+
+
 def test_version_show(tester: CommandTester) -> None:
     tester.execute()
     assert tester.io.fetch_output() == "simple-project 1.2.3\n"